Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1984-12-28
1985-11-26
Schain, Howard E.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
428436, 428524, 524 35, 524594, 525504, 525505, 528129, 528145, 528158, 528162, 528163, 528171, C08G 832, C08G 828, C08G 1406
Patent
active
045555443
ABSTRACT:
In a process for hardening phenol-formaldehyde resol resins, comprising conducting the hardening of the resins with an acidic solution of water and/or an organic solvent having dissolved therein an aromatic sulphonic acid and/or concentrated sulphuric acid, the improvement comprising the hardening in the presence of aniline added to the phenolic resin beforehand in a quantity of between about 0.5 and 2% relative to the weight of the phenolic resin whereby the pot life is extended and the cure time is satisfactory, the resultant products being especially useful as prepegs.
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Cousin Michel
Meyer Nicolas
Schain Howard E.
Societe Chimique des Charbonnages CDF Chimie, S.A.
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